package com.mmall.util;

import lombok.extern.slf4j.Slf4j;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import org.codehaus.jackson.map.ser.impl.SimpleFilterProvider;
import org.codehaus.jackson.type.TypeReference;

import java.io.IOException;

/**
 * Json 转化工具类
 * Created by megan on 2018/1/21.
 */
@Slf4j
public class JsonMapper {
    private static ObjectMapper objectMapper = new ObjectMapper();

    static {
        //config
        objectMapper.disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES);
        objectMapper.configure(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS,false);
        objectMapper.setFilters(new SimpleFilterProvider().setFailOnUnknownId(false));
        objectMapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_EMPTY);
    }

    /**
     * Obj--->Str
     * @param src
     * @param <T>
     * @return
     */
    public static <T> String obj2String(T src){
        if(src == null){
           return null;
        }
        try {
            return  src instanceof String ? (String)src : objectMapper.writeValueAsString(src);
        } catch (IOException e) {
            log.warn("parse object to string exception,error:{}", e);
            return  null;
        }
    }

    /**
     * str--->obj
     * @param src
     * @param typeReference
     * @param <T>
     * @return
     */
    public static <T> T string2Object(String src, TypeReference typeReference){
        if(src == null || typeReference == null){
            return null;
        }
        try {
            return (T) (typeReference.getType().equals(String.class) ? src : objectMapper.readValue(src, typeReference));
        } catch (Exception e) {
            log.warn("parse string to object exception ,string:{},TypeReference:{},error:{}",src,typeReference.getType(),e);
            return null;
        }
    }

}
